This amendment has been approved by the Ethic Committee on July 7, 2007. In March 2009, a new amendment has been approved by the EC. This amendment allowed to revise the number of patients to enroll (reduced to 44) and this lead us to modify also the primary endpoint : variation of BNP levels between H0 and H24 (H0 defined as the nearest value of BNP level obtained before the randomization).Showing a more important BNP levels decrease in the experimental group compared to standard treatment group, the investigators obtain an indirect argument to show a superior efficacy of the tested strategy.